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(No Model.) 2 Sheets-Sheet 1. I

J. A. OOOMBES.

OONGBNTRATOB.

No. 493,070. Patented Mar. '7, 1893. I,

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ATTORNEYS W/TNES S. fl

(No Model.) v 2 Sheets-Sheet 2 J. A. GOOMBES. GONOENTRATOR.

No.498,070. k) PatentedMa Z 1893.

W/TNESSES:

' INVENTOR MW 5 Jmm ATTORNEYS v UNITED STATES.

PATENT OFFICE,

JOSEPH ALLISON OOOMBES, OF LONDON, ENGLAND.

'CONCENTRATOR.

SPECIFICATION forming part Of Letters Patent NO. 493,070, dated March 7, 1893. Application filed July 19, 1392. Serial No. 40,463. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH ALLISON GOOMBES, of London, England, have invented a new and Improved Hand-Power Concentrator,of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved hand power concentrator which is simple and durable in construction, very efiective in operation and designed for conveniently and thoroughly separating gold from gravel and alluvial beds, and also for saving precious metals from pulverized quartz and tailings, without the aid of water, quicksilver or chemicals.

The invention consists of certain parts and details, and combinations of the same, as will be hereinafter described and then pointed out in the claims.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar letters of referenceindicate corresponding parts in all the figures.

Figure 1 is a side elevation of the improvement with parts broken out. Figs. 2 and 3 are end views of the same. Fig. 4 is a plan View of the agitating screen; and Fig. 5 is a sectional side elevation of the same on the line 55 of Fig. 4.

The improved hand power mining machine is provided with a suitably constructed frame A, in which is arranged a vertically-disposed U-shaped tube B having the legs B and B and the middle or curved portion B connecting the upper ends of the legs with each other, as will be readily understood by reference to Fig. 1. The lower end of the leg B of the tube B is connected with an exhaust fan O and one side of the other leg B is connected with a hopper D having an inclined bottom and discharging into the said leg B of the tube'B.

In the extreme lower end of the leg B directly below the hopper D is arranged a drawer E having a perforated front and serving to collect the precious metals as hereinafter more fully described. The drawer E as well as the lower end of the leg B, are supported on a suitable post A erected in the frame A.

Above the top of the hopper D is arranged an agitating screen F hung on chains or ropes G suspended from the frame A and arranged tovpermit the screen to swing longitudinally, the necessary motion being given by a mechanism hereinafter more fully described. The agitating screen F is formed with a series of transversely-extendin g and inclined sieves F, F and F located one above the other, the lowermost sieve discharging into the open end of the hopper D. The lowermost ends of the sieve's- F, F and F discharge the tailings onto a foot board F extending transversely on the bottom of the screen at one end ofthe same, the said board discharging into a chute H for carrying off the tailings.

. In order to impart a swinging motion to the agitating screen F and also to actuate the exhaustfan G, Iprovide amechanism J mounted on the frame A and arranged as follows: In standards J is journaled a shaft K provided on its ends with crank arms K for imparting a rotary motion to the said shaft. On the shaft K is secured a sprocket wheel L over which the sprocket chain L passes, also passing over a sprocket pinion L secured on a shaft L journaled in the standards J and carrying apulley L connected by a belt L with the pulley G of the exhaust fan 0. Thus, when the shaft K is turned, a rotary motion is transmitted to the shaft L which by the pulley L the belt L and the pulley C actuates the exhaust fan 0, so as to create a draft within the tube B. On the shaft K is also secured a pulley N connected by a belt N with a small pulley N secured on a shaft N mounted to turn in suitable bearings on one end of the frame A. On this shaft N is secured an eccentric 0 connected by its eccentric rod 0 with a bell crank lever P fulcrumed on the frame A and connected by a link P, with a second bell crank lever P the pivot of which carries another like bell crank lover. The two bell crank levers P are connected by links P with the front and rear of the screen F so that when the shaft K is rotated, a swinging motion is transmitted to the said screen by the mechanism just described. It is understood that the rotary motion of the shaft K is transmitted to the shaft N which, by the eccentric O imparts a swingingv motion to the bell crank lever P and the latter a like motion to the bell crank levers P so that the links P impart a swinging motion to the screen exhaust fan 0 are actuated in the manner described.

In the leg B of the bent tube 13 and near the upper end of the said leg is arranged a transversely-extending retainer or bafile plate Q and a similar retainer Q is arranged in the curved part B of the tube, the said retainers serving as resistance bars for the lighter material passing through the said tube caused by the suction of the exhaust fan 0. The said retainers or battle plates are constructed of hopper I from which it falls onto the upper most sieve F of the screen F and as the lat-" ter receives'a swinging motion, the material I is agitated, the finer particles passing through the sieve to the next lower sieve F and from the latter the still finer material passes through to the bottomsieveand then into the hopper D, while the tailings pass over the ends of the sieves onto the transverse board F 110 be dischargedinto the chute Hand carried to one side of the machine.

In order to prevent nuggets or other large piecesof preciousmetalsfrom passingover the screens to the chute II, I provide the sieves with transversely extending rifiiles F which retain the nuggets on the sieves from which they may be removed from time to time.-

The material passing down the hopperD into one side of the leg 13' is subjected to the draft caused by the exhaust fan 0 so that the light material is drawn up theleg B through the curved part B down the leg B to be finally discharged through theexhaust fan 0. T-heheavier particles drop down the leg 13 into the drawer E from which they are removed from time to time. Any flour gold which maybe drawn up by the draft is retained and accumulates in the box R, as previously described. The drawer E is perforated as described, to admit a very light current of air for the purpose of carrying away any dirt or fine sand that may accumulate in the drawer, and thus leave the gold therein clean; and, also, for the purpose of partly breaking up the main air current and thus producing eddies therein, which have the effect of causing it to hold in suspension, as it were, any float gold so that the latter may collect in the receptacle, R, instead of being carried past it.

It is understood that by'closing the damper S thedraft in the leg B and middle part B is reduced, and by opening the :said damper the full force ot theexha-ust-fan G acts on the material passing from the hopper D into the leg B.

Having thus fiullydescribed my invention, I claimas new and desire tosecure by Letters Patent- 1. In a hand power mining machine, the combination with an inverted U-shaped tube, of an exhaust fan connected with one end'of thesaid tube a hopper connected with one sideof the other leg of the tuibemnagitating screen arranged over the said hopper and discharging into the same, a drawer arranged in the tube below the said hopper and .having-a perforated front through which air is admitted to produce eddies in the main icurrentand to collect .the valuable metal, and a boxiarranged in the under side of the'middle portion of the said tube to collect and retain flour gold as set forth.

2. The improved concentrator, composed of the bent tube having the perforated front drawerEand the box R arranged as specified,'the agitating screen F, and exhaust fan 0, the driving gear, and rods, levers and belts connecting the same with the screen and fan,

as shown and described.

JOSEPI-I ALLISON GOOMBES. Witnesses:

G. F. WARREN, THOMAS LAKE, Both of 17 Gracechurch Street, London. 

